class_docstr: Class which stores statistics about validation of the submissions.
docstr: Add one successfull submission of given type.
docstr_tok: ["Add","one","successfull","submission","of","given","type","."]
code: def add_success(self, submission_type):
      """Add one successfull submission of given type."""
      self._update_stat(submission_type, 1, 0)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import argparse
  import csv
  import logging
  import os
  import random
  import shutil
  import subprocess
  import tempfile
  from six import iteritems
  import validate_submission_lib
label_desc: Use image node_id 3 for calling the ValidationStats obj's underlying member method code with example usage: obj.add_success(submission_type) without return types